/****************************************************************************
 *
 * Copyright 2018 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/
/****************************************************************************
 * lib/libc/string/lib_strsignal.c
 *
 *   Copyright (C) 2018 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <signal.h>
#include <string.h>

/****************************************************************************
 * Private Data
 ****************************************************************************/

/* We don't know what signals names will be assigned to which signals in
 * advance and we do not want to return a volatile value.  One solution is
 * this silly array of useless names:
 */

static FAR const char *g_default_sigstr[32] = {
	"Signal 0",
	"Signal 1",
	"Signal 2",
	"Signal 3",
	"Signal 4",
	"Signal 5",
	"Signal 6",
	"Signal 7",
	"Signal 8",
	"Signal 9",
	"Signal 10",
	"Signal 11",
	"Signal 12",
	"Signal 13",
	"Signal 14",
	"Signal 15",
	"Signal 16",
	"Signal 17",
	"Signal 18",
	"Signal 19",
	"Signal 20",
	"Signal 21",
	"Signal 22",
	"Signal 23",
	"Signal 24",
	"Signal 25",
	"Signal 26",
	"Signal 27",
	"Signal 28",
	"Signal 29",
	"Signal 30",
	"Signal 31",
};

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: psignal
 *
 * Description:
 *   The strsignal() function will map the signal number in signum to an
 *   implementation-defined string and will return a pointer to it.
 *
 ****************************************************************************/

FAR char *strsignal(int signum)
{
	/* Handle invalid signals */

	if (!GOOD_SIGNO(signum)) {
		return (FAR char *)"Invalid Signal";
	}

	/* Handle named signals */

	switch (signum) {
		/* Standard signals */

#ifdef SIGUSR1
	case SIGUSR1:
		return (FAR char *)"SIGUSR1";
#endif

#ifdef SIGUSR2
	case SIGUSR2:
		return (FAR char *)"SIGUSR2";
#endif

#ifdef SIGALRM
	case SIGALRM:
		return (FAR char *)"SIGALRM";
#endif

#ifdef SIGCHLD
	case SIGCHLD:
		return (FAR char *)"SIGCHLD";
#endif

#ifdef SIGPOLL
	case SIGPOLL:
		return (FAR char *)"SIGPOLL";
#endif

#ifdef SIGSTOP
	case SIGSTOP:
		return (FAR char *)"SIGSTOP";
#endif

#ifdef SIGSTP
	case SIGSTP:
		return (FAR char *)"SIGSTP";
#endif

#ifdef SIGCONT
	case SIGCONT:
		return (FAR char *)"SIGCONT";
#endif

#ifdef SIGKILL
	case SIGKILL:
		return (FAR char *)"SIGKILL";
#endif

#ifdef SIGINT
	case SIGINT:
		return (FAR char *)"SIGINT";
#endif

	/* Non-standard signals */

#ifdef SIGCONDTIMEDOUT
	case SIGCONDTIMEDOUT:
		return (FAR char *)"SIGCONDTIMEDOUT";
#endif

#ifdef SIGWORK
	case SIGWORK:
		return (FAR char *)"SIGWORK";
#endif

	default:
		break;
	}

	/* Return a string devoid is meaning */

	return (FAR char *)g_default_sigstr[signum];
}
